"Post" Button to Submit Replies

Any way to get a "Post" button to submit replies? While I appreciate the convenience of being able to hit "enter" to submit a reply, I've got a lot of users who are completely avoiding breaks between paragraphs due to submission and the "single-paragraph message" is a lot more difficult to consume.

The "posts" have this system/layout already, so it would be nice to have something consistent as well.